The emergency care unit is characterized for its multiplicity of peoplepathologies that appeal to it, while many need focused cares in the physical needs,others will need cares more focused in the psychological or social needs or then ina holistic approach they will need cares that embrace a complex boarding withfocus to all the systems. The application of the theoretical models of nursing, inthese circumstances becomes a complicated task, therefore it doesnt haveadequacy of only one model in its integral way as being the most correct, and alsoit does not exist no model made only for the adequacy to the emergency or criticalcare. It is part of the nursing evolution, the creation of theoretical models, they arethe guide to the practice, of course created by the reflection in action andtherefore, when the theories are no longer adjusted to the practices, caused eitherby its evolution or for some change of the circumstances or of the society, they arediscarded and created others.